CN116224291A - Displacement and distance laser measuring device and method with coaxial visible guided laser - Google Patents

Displacement and distance laser measuring device and method with coaxial visible guided laser Download PDF

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Publication number
CN116224291A
CN116224291A CN202211710964.6A CN202211710964A CN116224291A CN 116224291 A CN116224291 A CN 116224291A CN 202211710964 A CN202211710964 A CN 202211710964A CN 116224291 A CN116224291 A CN 116224291A
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China
Prior art keywords
laser
invisible
displacement
visible
distance
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CN202211710964.6A
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Chinese (zh)
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汪迎春
陆海丰
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Zhigan Suzhou Photon Technology Co ltd
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Zhigan Suzhou Photon Technology Co ltd
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Priority to CN202211710964.6A priority Critical patent/CN116224291A/en
Publication of CN116224291A publication Critical patent/CN116224291A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
    • G01S7/481—Constructional features, e.g. arrangements of optical elements
    • G01S7/4811—Constructional features, e.g. arrangements of optical elements common to transmitter and receiver
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/06—Systems determining position data of a target
    • G01S17/08—Systems determining position data of a target for measuring distance only

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Electromagnetism (AREA)
  • Optical Radar Systems And Details Thereof (AREA)
  • Instruments For Measurement Of Length By Optical Means (AREA)

Abstract

The invention relates to the technical field of laser measurement, and discloses a displacement and distance laser measurement device and method with coaxial visible guided laser, comprising the following steps: the system comprises a measuring laser emission source, a guiding laser emission source, a wavelength division multiplexer and a logic controller, wherein the measuring laser emission source emits invisible laser, and the guiding laser emission source emits visible laser; the invisible laser enters the wavelength division multiplexer after being measured by the logic controller, the visible laser directly enters the wavelength division multiplexer, the invisible laser and the visible laser are converged in the wavelength division multiplexer to form an optical carrier for emitting to the measured object, the optical carrier is reflected by the measured object and enters the wavelength division multiplexer again to separate the reflected invisible laser, and the reflected invisible laser reaches the logic controller and interferes with the originally measured invisible laser, so that displacement and distance measurement of the measured object are realized according to an interference result. The invention can use invisible laser to measure, which greatly expands the application scene of measurement.

Description

Displacement and distance laser measuring device and method with coaxial visible guided laser
Technical Field
The invention relates to the technical field of laser measurement, in particular to a displacement and distance laser measurement device and method with coaxial visible guided laser.
Background
Autonomous navigation technologies such as mobile robots, AGVs and autopilots are increasingly used, and sensing sensors used by these technologies are rapidly developed. LIDAR (Light Detection and Ranging, LIDAR) sensors have the advantage of high accuracy ranging, high accuracy resolution, and thus are more widely used than other sensors, such as ultrasonic radar, vision sensors, and the like.
There are various implementation methods for laser radar ranging, such as triangulation ranging, TOF (Time of Flight) ranging, FMCW (Frequency Modulated Continuous Wave, FMCW, frequency modulated continuous wave) ranging, and so on. Triangulation ranging is a method for calculating a measurement distance by forming a triangle based on emitted light and reflected light and by imaging positions and displacements of light spots on a CCD position sensor; however, due to the limitation of the pixel size of the CCD position sensor, the accuracy of triangulation ranging is generally limited to millimeter level, and the ranging method can only perform short-distance measurement, and the accuracy thereof is worse as the measurement distance is further. The TOF method is a method for directly calculating the distance according to the time difference between transmission and reception by adopting discontinuous pulse laser, and the distance measuring precision is higher and does not decrease along with the increase of the distance; however, the accuracy of this method is also typically only on the order of millimeters. Therefore, both methods are difficult to apply to the measurement of micro-scale and even nano-scale scenes. The FMCW ranging method is: and transmitting continuous signals with certain bandwidth and linearly-changed frequency, performing fast Fourier transform on the received continuous signals, calculating the time difference of the two signals by the frequency difference of the transmitted and received signals, and finally obtaining a corresponding distance value according to the time difference. The FMCW method has strong interference resistance based on the coherent principle and has the advantage of higher signal to noise ratio and is widely focused.
However, most of displacement and distance lidars based on the FMCW method adopt short-wavelength visible measurement light, and the measurement light of the lidar is always visible in the measurement process, so that measurement by using invisible laser cannot be realized, and a measurement scene has great limitation.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects in the prior art, and provide the displacement and distance laser measuring device and method with coaxial visible guided laser, which can use invisible laser for measurement and greatly expand the application scene of measurement.
In order to solve the technical problems, the invention provides a displacement and distance laser measuring device with coaxial visible guided laser, which comprises a measuring laser emitting source, a guided laser emitting source, a wavelength division multiplexer and a logic controller,
the measuring laser emission source emits invisible laser, and the guiding laser emission source emits visible laser;
the invisible laser enters the wavelength division multiplexer after being measured by the logic controller, the visible laser enters the wavelength division multiplexer, the invisible laser and the visible laser are converged in the wavelength division multiplexer to form an optical carrier, the optical carrier is transmitted to the measured object, the optical carrier is reflected by the measured object and enters the wavelength division multiplexer again to separate the reflected invisible laser, and the reflected invisible laser reaches the logic controller and interferes with the invisible laser originally measured by the logic controller, so that displacement and distance measurement of the measured object are realized according to an interference result.
In one embodiment of the invention, the logic controller is a programmable logic controller chip.
In one embodiment of the present invention, the invisible laser light emitted from the measuring laser light emitting source is a long wavelength laser light.
In one embodiment of the present invention, the visible laser light emitted from the guided laser light emitting source is a short wavelength laser light.
In one embodiment of the present invention, the optical sensor further comprises a photodetector, and after the reflected invisible laser reaches the logic controller and interferes with the measured invisible laser, the interference light enters the photodetector, and the photodetector analyzes the interference light to realize displacement and distance measurement of the measured object.
In one embodiment of the present invention, the device further comprises a collimating lens, and the optical carrier wave passes through the collimating lens when being emitted to the object to be measured.
The invention also provides a displacement and distance laser measuring method with coaxial visible guided laser, comprising the following steps:
using a measurement laser light emitting source to emit invisible laser light as measurement laser light, and using a guide laser light emitting source to emit visible laser light as guide laser light;
the invisible laser enters the wavelength division multiplexer after being measured by the logic controller, the visible laser enters the wavelength division multiplexer, the invisible laser and the visible laser are converged in the wavelength division multiplexer to form an optical carrier, the optical carrier is transmitted to the measured object, the optical carrier is reflected by the measured object and enters the wavelength division multiplexer again to separate the reflected invisible laser, and the reflected invisible laser reaches the logic controller and interferes with the invisible laser originally measured by the logic controller, so that displacement and distance measurement of the measured object are realized according to an interference result.
In one embodiment of the invention, the optical carrier passes through a collimating lens when being emitted to the object to be measured, and is focused into collimated light after passing through the collimating lens;
and adjusting the size of a light spot of the guided laser on the measured object by moving the collimating lens, so as to realize focusing of the measuring laser.
In one embodiment of the invention, the brightness of the guided laser is adjusted when measurements of different distances are made, and the guided laser is turned off when the optical carrier is aligned with the object under test.
The invention also provides a displacement and distance laser measuring device with the coaxial visible guide laser, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the steps of the displacement and distance laser measuring method with the coaxial visible guide laser when executing the computer program.
Compared with the prior art, the technical scheme of the invention has the following advantages:
the invention adopts the invisible laser with long wavelength as the measuring laser, adopts the coaxial visible light with short wavelength as the guiding laser of the measuring laser, and realizes the displacement or distance measurement of the measured objects with different distances by focusing the guiding laser on the measured objects, thereby realizing the measurement by using the invisible laser and greatly expanding the measuring application scene.
Drawings
In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, in which:
fig. 1 is a schematic structural view of the present invention.
Description of the specification reference numerals: 1. measuring a laser emission source; 2. guiding a laser emission source; 3. a programmable logic controller chip; 4. a wavelength division multiplexer; 5. a photodetector; 6. a collimating lens.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
Example 1
Referring to fig. 1, the invention discloses a displacement and distance Laser measuring device with coaxial visible guided Laser, which comprises a measuring Laser (measurement Laser) Laser emission source, a Guiding Laser (Guiding Laser) Laser emission source, a wavelength division multiplexer 4 (Wavelength Division Multiplexing, WDM) and a logic controller. The measurement laser light emitting source 1 emits invisible laser light as measurement laser light, and the guide laser light emitting source 2 emits visible laser light as guide laser light, the invisible laser light and the visible laser light being coaxial. The invisible laser enters the wavelength division multiplexer 4 after being measured by the logic controller, the visible laser enters the wavelength division multiplexer 4, and the invisible laser and the visible laser are converged in the wavelength division multiplexer 4 to form an optical carrier to be emitted to the measured object, so that the coaxiality of the measuring laser and the guiding laser is realized. The optical carrier wave is reflected by the measured object and then enters the wavelength division multiplexer 4 again to separate out the reflected invisible laser, and the reflected invisible laser reaches the logic controller and interferes with the invisible laser originally measured by the logic controller, so that the displacement and distance measurement of the measured object are realized according to the interference result.
In this embodiment, the logic controller is a programmable logic controller (Programmable Logic Controller, PLC) chip 3. The invisible laser light emitted from the measuring laser light emitting source 1 is long wavelength laser light. The visible laser emitted by the guided laser light emitting source 2 is a short wavelength laser.
In this embodiment, the optical sensor further includes a Photodetector (PD), and after the reflected invisible laser light reaches the logic controller and interferes with the measured invisible laser light, the interference light enters the photodetector 5, and the photodetector 5 analyzes the interference light to realize displacement and distance measurement of the measured object.
In this embodiment, the device further includes a collimator lens 6, and the optical carrier wave passes through the collimator lens 6 when emitted to the object to be measured.
Example two
The invention also discloses a displacement and distance laser measuring method with coaxial visible guided laser, comprising the following steps:
the invisible laser is emitted as the measurement laser by using the measurement laser emission source, and the visible laser is emitted as the guide laser by using the guide laser emission source. The invisible laser enters the wavelength division multiplexer after being measured by the logic controller, the visible laser enters the wavelength division multiplexer, and the invisible laser and the visible laser are converged in the wavelength division multiplexer to form an optical carrier to be transmitted to the measured object, so that the coaxiality of the measuring laser and the guiding laser is realized. The optical carrier wave is reflected by the measured object and then enters the wavelength division multiplexer again to separate out the reflected invisible laser, and the reflected invisible laser reaches the logic controller and interferes with the invisible laser originally measured by the logic controller, so that the displacement and distance measurement of the measured object are realized according to the interference result.
The light carrier wave passes through the collimating lens when being emitted to the object to be measured, and is focused into collimated light after passing through the collimating lens. At the time of coaxial of the two laser beams, the position of the guide laser at the measured object, namely the position of the measuring laser at the measured object, is adjusted by moving the collimating lens, namely the focusing of the guide laser at the measured object with different distances is adjusted, so that the focusing of the measuring laser is realized.
The brightness of the guided laser is adjusted when the measurement of different distances is carried out, so that the guided laser is convenient to observe; when the optical carrier is aligned with the object to be measured, the guiding laser is turned off so as to avoid the light pollution of the guiding laser.
Example III
The invention also discloses a displacement and distance laser measuring device with the coaxial visible guide laser, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the steps of the displacement and distance laser measuring method with the coaxial visible guide laser when executing the computer program.
The invention adopts the invisible measuring light with long wavelength, but the invisible light can not know the spot position on the measured object and can not focus the spots on the measured object with different distances, so the coaxial visible light is adopted as the guiding light of the measuring light, and the displacement or distance measurement of the measured object is realized by focusing the guiding light on the measured object.
Compared with the prior art, the invention has the following advantages:
1. the invention adopts the invisible laser with long wavelength as the measuring laser, adopts the coaxial visible light with short wavelength as the guiding laser of the measuring laser, and realizes the displacement or distance measurement of the measured objects with different distances by focusing the guiding laser on the measured objects, thereby realizing the measurement by using the invisible laser and greatly expanding the measuring application scene. The application scene of the invention comprises the field of measuring the vibration displacement of a vibration object, such as noise detection, rotation shaft runout detection and the like.
2. According to the invention, through brightness adjustment and closing operation of the guided laser, measurement requirements of different distances can be met, so that measurement of more scenes is realized.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present invention will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.

Claims (10)

1. A displacement and distance laser measuring device with coaxial visible guiding laser is characterized in that: comprises a measuring laser emission source, a guiding laser emission source, a wavelength division multiplexer and a logic controller,
the measuring laser emission source emits invisible laser, and the guiding laser emission source emits visible laser;
the invisible laser enters the wavelength division multiplexer after being measured by the logic controller, the visible laser enters the wavelength division multiplexer, the invisible laser and the visible laser are converged in the wavelength division multiplexer to form an optical carrier, the optical carrier is transmitted to the measured object, the optical carrier is reflected by the measured object and enters the wavelength division multiplexer again to separate the reflected invisible laser, and the reflected invisible laser reaches the logic controller and interferes with the invisible laser originally measured by the logic controller, so that displacement and distance measurement of the measured object are realized according to an interference result.
2. The displacement and distance laser measurement device with coaxial visible guided laser light of claim 1, wherein: the logic controller is a programmable logic controller chip.
3. The displacement and distance laser measurement device with coaxial visible guided laser light of claim 1, wherein: the invisible laser emitted by the measuring laser emission source is long wavelength laser.
4. The displacement and distance laser measurement device with coaxial visible guided laser light of claim 1, wherein: the visible laser emitted by the guided laser emission source is short-wavelength laser.
5. The displacement and distance laser measurement device with coaxial visible guided laser light of claim 1, wherein: the device also comprises a photoelectric detector, wherein after the reflected invisible laser reaches the logic controller and interferes with the measured invisible laser, interference light enters the photoelectric detector, and the photoelectric detector analyzes the interference light to realize displacement and distance measurement of a measured object.
6. A displacement and distance laser measuring device with coaxial visible guided laser according to any of claims 1-5, characterized in that: the device also comprises a collimating lens, wherein the light carrier wave passes through the collimating lens when being emitted to the object to be measured.
7. A method of displacement and distance laser measurement with coaxial visible guided laser light, comprising: using a measurement laser light emitting source to emit invisible laser light as measurement laser light, and using a guide laser light emitting source to emit visible laser light as guide laser light;
the invisible laser enters the wavelength division multiplexer after being measured by the logic controller, the visible laser enters the wavelength division multiplexer, the invisible laser and the visible laser are converged in the wavelength division multiplexer to form an optical carrier, the optical carrier is transmitted to the measured object, the optical carrier is reflected by the measured object and enters the wavelength division multiplexer again to separate the reflected invisible laser, and the reflected invisible laser reaches the logic controller and interferes with the invisible laser originally measured by the logic controller, so that displacement and distance measurement of the measured object are realized according to an interference result.
8. The method of measuring displacement and distance laser light with coaxial visible guided laser light of claim 7, wherein: the light carrier wave passes through a collimating lens when being emitted to the object to be measured, and is focused into collimated light after passing through the collimating lens;
and adjusting the size of a light spot of the guided laser on the measured object by moving the collimating lens, so as to realize focusing of the measuring laser.
9. The method of measuring displacement and distance laser light with coaxial visible guided laser light of claim 8, wherein: the brightness of the guided laser is adjusted when the measurement of different distances is carried out, and the guided laser is turned off when the optical carrier is aligned with the measured object.
10. A displacement and distance laser measurement device with coaxial visible guided laser, characterized in that: comprising a memory, a processor and a computer program stored on the memory and executable on the processor, said processor implementing the steps of the displacement and distance laser measurement method with coaxial visible guided laser according to any of claims 7-9 when said computer program is executed.
CN202211710964.6A 2022-12-29 2022-12-29 Displacement and distance laser measuring device and method with coaxial visible guided laser Pending CN116224291A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116626696A (en) * 2023-07-20 2023-08-22 北京摩尔芯光半导体技术有限公司 Frequency modulation continuous wave laser range unit
CN117492027A (en) * 2024-01-03 2024-02-02 成都量芯集成科技有限公司 Laser scanning-based identification device and method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116626696A (en) * 2023-07-20 2023-08-22 北京摩尔芯光半导体技术有限公司 Frequency modulation continuous wave laser range unit
CN117492027A (en) * 2024-01-03 2024-02-02 成都量芯集成科技有限公司 Laser scanning-based identification device and method thereof
CN117492027B (en) * 2024-01-03 2024-03-15 成都量芯集成科技有限公司 Laser scanning-based identification device and method thereof

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